NERITOPSIS. 



by which it may be distinguished at once from it. We 

 have never seen any epidermis : these shells do not appear 

 to be vividly coloured. 



We are not acquainted with the locality of the recent 

 species which is represented in our plate; the Island of 

 Vanikoro is however the native place of another recent 

 species. Two fossil species are found at Bordeaux, one 

 near Turin,* and one in Normandy. 



* This appears to have belonged to a bed of tertiary formation which has 

 been subjected to volcanic action and in which the fossils have consequently 

 been blackened. 



